This is one of the most important books on the subject. It consists of three main parts accompanied by seven appendixes. The first division deals mainly with general technic, emphasizing the use of a routine technic and the importance of a complete examination; moreover, it points out the radiologic risks and their avoidance by careful screening; it proves the necessity of protection and a safe equipment as well as a proper technic of palpation of the abdomen during the fluoroscopy. Different technics of the radiologic examinations are mentioned. The author concludes the first part with a series of precepts for examination, which he divides into "do's" and "don'ts." The second part is devoted to the radiographic examination of the "normal" gastro-intestinal tract; it is divided into anatomy and physiology. Barclay concludes that there is no absolutely normal alimentary tract: "it may approximate to the average but there is no fixed